44 lines
1.2 KiB
TypeScript
44 lines
1.2 KiB
TypeScript
import { BaseProvider } from "@ethersproject/providers";
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import { Contract } from "@ethersproject/contracts";
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import { Interface } from "@ethersproject/abi";
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import { IAddressResolver } from "./address-resolver";
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import erc20 from "../../erc20.json";
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import { TokenMeta } from "../../types";
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const erc20Interface = new Interface(erc20);
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export class ERCTokenResolver implements IAddressResolver<TokenMeta> {
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async resolveAddress(
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provider: BaseProvider,
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address: string
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): Promise<TokenMeta | undefined> {
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const erc20Contract = new Contract(address, erc20Interface, provider);
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try {
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const name = (await erc20Contract.name()) as string;
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if (!name.trim()) {
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return undefined;
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}
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const [symbol, decimals] = (await Promise.all([
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erc20Contract.symbol(),
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erc20Contract.decimals(),
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])) as [string, number];
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// Prevent faulty tokens with empty name/symbol
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if (!symbol.trim()) {
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return undefined;
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}
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return {
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name,
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symbol,
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decimals,
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};
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} catch (err) {
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// Ignore on purpose; this indicates the probe failed and the address
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// is not a token
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}
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return undefined;
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}
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}
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